A curious few weeks after that load of missiles was offloaded in Yemen, some sort of military fanfare was going on in Syria. The local press was going to be invited and the whole thing was promised to be a real Jihad-a-Rama. Well, the explosion left a crater a mile accross before the press could be driven on the busses to see whatever was going to be showed to them. Ambulances were arriving at the staging point, and even they were told to return since the human element was mostly splatter and hot gasses.
Suspicion is that those missiles we temporarily detained at sea and then let go to Yemen (at the outrage of intelligent people), were tinkered with by our military engineers. When some Syrian Raghead grunt followed the NK supplied manual during set-up, the master switch was rewired to the self destruct circuit or such.
Pretty damn effective......